Hi Andrew,
Although i have no experience with working gammas, i have seen a few YouTube video tutorials that might assist.
From what i have been told also, gamma is a calm water lure so much harder to work in rough conditions. Might be wrong, just what i've been told.
If you haven't already, check out YouTube. Might help. Will also be plenty of info on this subject on this forum if you search.
Cheers, Chris